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# Measurement of spin correlations in $t\bart$ production using the matrix element method in the muon+jets final state in pp collisions at $\sqrt{s} =$ 8 TeV

Submit Time: 2016-09-12
Author:
Institute: 1.CMS Collaboration;

## Abstracts

 The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon + jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 inverse femtobarns. The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events that show SM spin correlations is measured to be 0.72 +/- 0.08 (stat) +0.15 -0.13 (syst), representing the most precise measurement of this quantity in the lepton + jets final state to date.
Recommended references： Khachatryan, Vardan and others.(2016).Measurement of spin correlations in $t\bart$ production using the matrix element method in the muon+jets final state in pp collisions at $\sqrt{s} =$ 8 TeV.[ChinaXiv:201609.00796] (Click&Copy)
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